#include<iostream>
#include<cstdio>
#include<cmath>

using namespace std;

int main()
{
    int R;
    double s;
    cin >> R;
    s = 3.14159 * (4 / 3.0) * pow(R, 3);
    cout << "VOLUME = ";
    printf("%.3lf", s);
    return 0;
}